1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define LOG_TAG "SQLiteGlobal"
18
19#include <jni.h>
20#include <JNIHelp.h>
21#include <android_runtime/AndroidRuntime.h>
22
23#include <sqlite3.h>
24#include <sqlite3_android.h>
25
26#include "android_database_SQLiteCommon.h"
27#include "android_util_Log.h"
28
29namespace android {
30
31// Limit heap to 8MB for now.  This is 4 times the maximum cursor window
32// size, as has been used by the original code in SQLiteDatabase for
33// a long time.
34static const int SOFT_HEAP_LIMIT = 8 * 1024 * 1024;
35
36
37// Called each time a message is logged.
38static void sqliteLogCallback(void* data, int iErrCode, const char* zMsg) {
39    bool verboseLog = !!data;
40    if (iErrCode == 0 || iErrCode == SQLITE_CONSTRAINT || iErrCode == SQLITE_SCHEMA) {
41        if (verboseLog) {
42            ALOGV(LOG_VERBOSE, SQLITE_LOG_TAG, "(%d) %s\n", iErrCode, zMsg);
43        }
44    } else {
45        ALOG(LOG_ERROR, SQLITE_LOG_TAG, "(%d) %s\n", iErrCode, zMsg);
46    }
47}
48
49// Sets the global SQLite configuration.
50// This must be called before any other SQLite functions are called.
51static void sqliteInitialize() {
52    // Enable multi-threaded mode.  In this mode, SQLite is safe to use by multiple
53    // threads as long as no two threads use the same database connection at the same
54    // time (which we guarantee in the SQLite database wrappers).
55    sqlite3_config(SQLITE_CONFIG_MULTITHREAD);
56
57    // Redirect SQLite log messages to the Android log.
58    bool verboseLog = android_util_Log_isVerboseLogEnabled(SQLITE_LOG_TAG);
59    sqlite3_config(SQLITE_CONFIG_LOG, &sqliteLogCallback, verboseLog ? (void*)1 : NULL);
60
61    // The soft heap limit prevents the page cache allocations from growing
62    // beyond the given limit, no matter what the max page cache sizes are
63    // set to. The limit does not, as of 3.5.0, affect any other allocations.
64    sqlite3_soft_heap_limit(SOFT_HEAP_LIMIT);
65
66    // Initialize SQLite.
67    sqlite3_initialize();
68}
69
70static jint nativeReleaseMemory(JNIEnv* env, jclass clazz) {
71    return sqlite3_release_memory(SOFT_HEAP_LIMIT);
72}
73
74static JNINativeMethod sMethods[] =
75{
76    /* name, signature, funcPtr */
77    { "nativeReleaseMemory", "()I",
78            (void*)nativeReleaseMemory },
79};
80
81int register_android_database_SQLiteGlobal(JNIEnv *env)
82{
83    sqliteInitialize();
84
85    return AndroidRuntime::registerNativeMethods(env, "android/database/sqlite/SQLiteGlobal",
86            sMethods, NELEM(sMethods));
87}
88
89} // namespace android
90